Plastic material dispenser



April l, 1941. v. E. DEwl-:Es

PLASTIC MATERIAL DISPENSER Filed Jan. 7, 1939.

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Patented Apr. 1, 1941 PLASTIC MATERIAL DISPENSER Vincent E. Dewees,Philadelphia, Pa., assignor to Calbar Paint & Varnish Company,Philadelphia, Pa., a corporation of Pennsylvaniay Application January 7,1939, Serial No. 249,713

2 Claims.

This invention relates to plastic material dispensers, that is to say,to improved means for dispensing and applying plastic materials such ascaulking compounds, putty, heavy greases, or the like.

More specifically considered, the invention relates to a cartridge inwhich the plastic material is initially placed, usually at the factory,said cartridge being adapted to be inserted in a gun of any preferredtype, but with which the cartridge is coordinated.

'I'he principal object of the present invention is to provide acartridge for plastic materials, such as caulklng compounds, putty,greases, or the like, which may be filled at the factory, and deliveredto the user for use in a gun having means for applying pressure to expelthe plastic material through the nozzle or other delivery member of thegun, which cartridge will be relatively inexpensive, which may bereadily and conveniently inserted in the gun, and in the use of whichWaste of the material will be reduced to a minimum.

Heretofore, various types of preilled cartridges or inserts have beensuggested for use in guns for dispensing and applying plastic materials,but none of these have proved entirely satisfactory. Nevertheless, thereis recognized need for such devices, and the saving of time of the userthrough the employment of such prelled cartridges or inserts is Wellunderstood.

The present invention, therefore, contemplates the provision of a novelform of cartridge adapted to be inserted in the barrel of a dispensinggun, which is quite emcient for its intended purpose. yet is sorelatively inexpensive that the same may be discarded after a singleuse.

The nature and characteristic features of the invention will be morereadily understood from the following description, taken in connectionwith the accompanying drawing forming part hereof, inwhich:

Figure 1 is a View, partly in section and partly in side elevation, of acaulking gun having in place therein a cartridge or insert embodying themain features of the present invention, the same being shown with theparts in their positions after a portion of the contents of thecartridge have been expelled therefrom;

Fig. 2 is a longitudinal section of a filled cartridge or insert as thesame is furnished to the user;

Fig. 3 is a perspective of a novel form of piston member employed inthe'cartridge; and

Fig. 4 is an enlarged diametral section of said piston member.

Referring now more particularly to Fig. 1 of .the drawing, there isthere shown a caulking gun of a more or less common type, in connectionwith which the cartridge of the present invention isadapted to be used.

Said gun comprises a cylindrical barrel I0, the respective ends of whichare threaded, as at II and I2, for the mounting thereon of a vhandleportion I3 at one end and a nozzle portion I4 at the other end. Thestock or handle portion I3 is provided with a cap member I5 which ismounted on the end of the barrel I0 by means of the threads I I abovereferred to.

The handle portion I3 may also'be provided with the usual grip lever I6for actuation, through suitable mechanism (not shown), of the piston rodIl. The piston rod I1 has, at its outer end, a handle I8 for thewithdrawal of the piston rod to the rearmost position after the contentsof the cartridge have been discharged. The inner end of the piston rodI1 is provided with an enlarged head portion I9, which coacts with thepiston portion of the cartridge, as will be hereinafter set forth.

'I'he nozzle portion I4 of the gun is also provided with a cap member20, mounted on the end of the barrel III by means of the threads I2hereinbefore referred to. and said cap member 20 is provided with adischarge nozzle 2l of any preferred type, which may be threadedtherein, so as to be replaceable by nozzles of other types and sizes.There is also provided a resilient washer 22 at -the end of the barrelIII within the cap member 2I|,for a purpose to be presently explained.

The cartridge proper comprises a cylindricalV device of such externaldiameter as to permit it to be inserted within the barrel I0 of the gun.The cylinder 30 of the cartridge is of such length that when it isinserted in the barrel III of the gun, and the cap members I5 and 20 atthe ends thereof are screwed into place, the ends of the cylinder 30 ofthe cartridge will be seated at the one end against the cap member I5and at the other end against the resilient washer 22, and thus anyleakage of the material around the forward end of the cylinder 30 of thecartridge will be prevented.

The cylinder 30 of the cartridge is preferably made of a cardboard tube,similar to the well known mailing tubes, but it is lined interiorly witha material Il such as Cellophane or the like, which is permanentlysecured to the material of the tube and which will present a smoothinterior surface,.and at the same time be impervious and chemicallyinert to the material contained within the cylinder. At one end of thefilled cartridge, there is mounted a piston member 32 made of relativelyheavy cardboard having a nat central disc portion 33 against which thehead portion i3 of the piston rod i1 abuts when the gun is in use. Therim 34 of the piston member 32 is flared at a slight angle ofinclination to the central disc portion 33 and the peripheral edge ofthe flared portion 34 of the piston member bears against the smoothinterior surface provided by the lining material 3l of the tube.

For the most eiilcient results. and as shown more particularly in Figs.3 and 4 of the drawing, the leading face of the piston member 32 has itscentral portion flat as at 35, and the rim portion 34 extends therefromat an obtuse angle, preferably from a definitely defined circular line36, while the follower face of the piston member 32 likewise has a fiatcentral portion 31 for engagement by the head portion i9 of the pistonrod Il, from which .flat portion the surface of the rim portion 34extends in a curved conformation as at 38.

However, the important consideration is that the peripheral edge 39 ofthe piston member 32, which bears against the smooth internal lining 3iof the tube, is of substantially the same thickness as that of the discproper. When the piston member is flexed by the applied pressure, theentire peripheral edge 39 is `brought into close intimate contact withthe interior surface provided by the lining material 3|, and leakagepast the piston member 32 is thus obviated.

The other end of the cartridge is provided with a thin disc 40 of paperor the like. Each end of the tube is provided with a cap member 4I madeof thin metal having flanges 42 extending over the outside of the tube30 at the ends thereof.

It will be seen that the piston member 32 at one end of the cartridgewill prevent the material contained therein from contacting with the capmember 4l at that end, and the paper disc 40 at the other end of thecartridge will prevent the material from contacting with the cap member4I at that end.

When it is desired to insert the cartridge within the gun for thepurpose of affording a further supply of material to the user, thepiston rod I1 is retracted to the rearmost position and the nozzle cap20 removed by unscrewing the same from the end of the barrel l of thegun. The shell of the empty cartridge which has previously been used inthe gun, is then removed therefrom. The filled cartridge is then takenand the caps 42 removed from the ends thereof, and also the paper disc40 at the end remote from the piston member 32 is also removed.

The cartridge is then inserted in the gun with the piston end toward thehead of the piston rod. The nozzle cap 20 is then replaced on the end ofthe barrel l0 of the gun and screwed up until one end of the cartridgeshell is pressed against the internal shoulder provided by the capmember l5, and the other end is pressed against the washer 22 providedin the cap member 2l at the forward end of the gun barrel.

The device is now ready for use, and the gun may then be manipulatedaccording to the particular mechanism thereof, causing the head il atthe end of the piston rod l1 to be advanced forwardly in the barrel,pushing the piston member 32 of the cartridge forward to expel thecontents of the cartridge through the nozzle of the It should be notedthat the piston member ol the cartridge is not of the usual form of cupmembers which have hereinbefore been suggested for such purposes. as ithas been found that the peculiar shape of the piston member, as hereinshown and described, will work much more emciently with a minimum ofleakage past the same, particularly when the same ls used within a tubelined with smooth surfaced material such as Cellophane or the like.

I claim:

l. A cartridge for use in guns for dispensing plastic materialcomprising a tube with an internal lining of smooth sheet material, afree piston member comprising a cardboard disc having a forwardlydisposed face for compression against the plastic material and arearwardly disposed face against which pressure is adapted to be appliedfor actuation of said piston member, said disc having a flat centralportion and a rim portion extending forwardly therefrom at an obtuseangle andat nearly a right angle with respect to the internal surface ofthe lining of the tube, said rirn portion having its outer terminal edgeportion between said faces in circumferential contact with said interiorlining, said terminal edge portion being of a width substantially equalto the thickness of the central portion of the disc and said terminaledge portion bearing against the internal surface of the tube throughoutits entire width.

2. A cartridge for use in'guns for dispensing plastic materialcomprising a cardboard tube with an internal lining of smooth syntheticcellulosic sheet material secured thereto, a piston member comprisingacardboard disc having a forwardly disposed face for compression againstthe plastic material and a rearwardly disposed face adapted for contactfor actuation of said piston member, said disc having a flat centralportion and a rim portion extending forwardly from the central portionat an obtuse angle and at nearly a, right angle with respect to theinternal surface of the lining of the tube, said rim portion having itsouter terminal edge portion between the said faces of a widthsubstantially the same as the thickness of the central portion of thedisc, said terminal edge portion being interiorly circuxnferentiallydisposed in con-l tact with and extending along and bearing throughoutits entire width against the smooth internal surface provided by thelining material of the tube, said disc being initially mounted at oneend of the tube, and removable cap members externally mounted on theends oi the tube.

VINCENT E. DEWEES.

